P0120 – Throttle Position Sensor (TPS) Circuit Malfunction: Causes, Symptoms & Fix

DTC P0120 means your car’s Throttle Position Sensor (TPS) circuit has a malfunction, affecting engine performance, acceleration, and fuel efficiency.

❓ What is Code P0120?

P0120 – Throttle Position Sensor/Switch "A" Circuit Malfunction
The TPS measures the position of the throttle valve and sends this information to the ECU for proper fuel-air mixture adjustment. A fault in the TPS circuit disrupts engine control.

⚠️ Symptoms of P0120

• 🚨 Check engine light ON

• 🚗 Poor acceleration or hesitation

• 🐢 Limp mode (limited power)

• 🛑 Engine stalling or rough idling

• ⛽ Poor fuel economy

🔍 Common Causes

1. 🔧 Faulty TPS sensor

2. 🔌 Damaged wiring or loose connections

3. 💡 Faulty throttle body assembly

4. 🧠 ECU receiving incorrect TPS signal

5. ⚡ Short circuit or open circuit in the wiring

🛠️ How to Fix P0120

✅ 1. Inspect TPS Sensor & Wiring

Look for damage, corrosion, or loose plugs.
👉 Shop Throttle Body & TPS Sensors →

✅ 2. Clean Throttle Body

Dirt or carbon buildup can interfere with sensor operation.

✅ 3. Check ECU for Faulty Signals

Use an OBD scanner to test live sensor readings.

✅ 4. Replace Faulty TPS Sensor or Throttle Body

👉 Engine Components & Assemblies →

🛒 Relevant Parts at nayapurnaonline.com

• ⚙️ Engine Components & Assemblies

• 🛠️ Throttle Body & TPS Sensors

• 🚗 Tata TPS & Throttle Parts

• 🚘 Hyundai Throttle Body & Sensors

• 🚙 Honda TPS & Throttle System Spares

🚗 Commonly Affected Vehicles

💡 Quick Tips

• Never spray harsh cleaners directly into electronic throttle bodies

• Ensure connectors are properly seated after servicing

• TPS faults affect both performance and fuel economy

✅ Final Words

A P0120 code affects your engine's throttle control, leading to poor performance. Fix it fast with reliable TPS sensors, wiring, and throttle body parts from nayapurnaonline.com.